Description
NLnet Labs Unbound, up to and including version 1.16.1, is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever-updating. From version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| NLnet Labs | Unbound | unspecified – ≤ 1.16.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | unbound | 1.16.2-1 | — |
| Debian 13 | unbound | 1.16.2-1 | — |
| Debian 12 | unbound | 1.16.2-1 | — |
| Debian 10 | unbound | 1.9.0-2+deb10u3 | DLA-3371-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | unbound | 1.13.1-1ubuntu5.1 | USN-5569-1 |
| Ubuntu 20.04 LTS | unbound | 1.9.4-2ubuntu1.3 | USN-5569-1 |
| Ubuntu 18.04 LTS | unbound | 1.6.7-1ubuntu2.5 | USN-5569-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | unbound | No fix yet | — |
| Ubuntu Pro 14.04 LTS | unbound | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | unbound +3 | 1.16.2-2.el9 | RHSA-2022:8062 |
| RHEL 8 | unbound +3 | 1.16.2-2.el8 | RHSA-2022:7622 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.6 EUS | unbound +3 | 1.7.3-17.el8_6.5 | RHSA-2024:2045 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | unbound +3 | 1.16.2-2.el9 | ALSA-2022:8062 |
| AlmaLinux 8 | unbound +3 | 1.16.2-2.el8 | ALSA-2022:7622 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | unbound | 1.16.2-2.el9 | RLSA-2022:8062 |
| Rocky Linux 8 | unbound | 1.16.2-2.el8 | RLSA-2022:7622 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | unbound | 1.20.0-150600.23.3.1 | SUSE-SU-2024:1923-1 |
| SLES 15 SP5 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
| SLES 15 SP4 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
| SLES 15 SP3 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
| SLES 15 SP2 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP4 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
| SLES for SAP 15 SP3 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
| SLES for SAP 15 SP2 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
| SLE Micro 5.5 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-2, SUSE-SU-2024:1991-1 |
| SLE HPC 15 SP4 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
| SLE HPC 15 SP3 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
| SLE HPC 15 SP2 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
| SUSE Manager Server 4.3 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
| SUSE Manager Proxy 4.3 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
| SUSE Enterprise Storage 7.1 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | unbound | 1.20.0-150600.23.3.1 | SUSE-SU-2024:1923-1 |
| openSUSE Leap 15.5 | unbound | 1.20.0-150100.10.13.1 | SUSE-SU-2024:1991-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | unbound | 1.16.2-r0 | — |
| Alpine v3.23 | unbound | 1.16.2-r0 | — |
| Alpine v3.22 | unbound | 1.16.2-r0 | — |
| Alpine v3.21 | unbound | 1.16.2-r0 | — |
| Alpine v3.20 | unbound | 1.16.2-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | unbound | 1.16.2-r0 | — |
| Alpine v3.18 | unbound | 1.16.2-r0 | — |
| Alpine v3.17 | unbound | 1.16.2-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | unbound +5 | 1.16.3-2.amzn2023.0.1 | ALAS2023-2023-078 |
| Amazon Linux 2 | unbound +4 | 1.7.3-15.amzn2.0.5 | ALAS2-2024-2468 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | unbound | 1.16.2-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | unbound +3 | 1.16.2-2.el9 | ELSA-2022-8062 |
| Oracle Linux 8 | unbound +3 | 1.16.2-2.el8 | ELSA-2022-7622 |
Advisories 17
- ALSA-2022:8062 Moderate: unbound security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2022:7622 Moderate: unbound security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:2045 Red Hat Security Advisory: unbound security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2022:8062 Red Hat Security Advisory: unbound security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-5569-1 unbound vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- WID-SEC-2022-2044 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 9, 2026
- DLA-3371-1 unbound - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:7622 Moderate: unbound security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2022:8062 Moderate: unbound security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2024:1923-1 Security update for unbound SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1991-1 Security update for unbound SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2022:7622 Red Hat Security Advisory: unbound security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- SUSE-SU-2024:1991-2 Security update for unbound SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2024-2468 Moderate: unbound security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 19, 2024
- ALAS2023-2023-078 Moderate: unbound security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 22, 2023
- ELSA-2022-8062 Moderate: unbound security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 22, 2022
- ELSA-2022-7622 Moderate: unbound security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 15, 2022
References
- https://www.nlnetlabs.nl/downloads/unbound/CVE-2022-30698_CVE-2022-30699.txt
- FEDORA-2022-f89beb0640 vendor-advisory
- FEDORA-2022-0a914d5c6b vendor-advisory
- GLSA-202212-02 vendor-advisory
- [debian-lts-announce] 20230329 [SECURITY] [DLA 3371-1] unbound security update mailing-list